JP3562822B2 - Method and apparatus for producing block-shaped dry ice - Google Patents

Method and apparatus for producing block-shaped dry ice Download PDF

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Publication number
JP3562822B2
JP3562822B2 JP02261593A JP2261593A JP3562822B2 JP 3562822 B2 JP3562822 B2 JP 3562822B2 JP 02261593 A JP02261593 A JP 02261593A JP 2261593 A JP2261593 A JP 2261593A JP 3562822 B2 JP3562822 B2 JP 3562822B2
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Prior art keywords
dry ice
carbon dioxide
dioxide gas
block
outlet nozzle
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JP02261593A
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JPH06234513A (en
Inventor
房雄 醍醐
直俊 関
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Mitsui Chemicals Inc
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Mitsui Chemicals Inc
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00Carbon; Compounds thereof
    • C01B32/50Carbon dioxide
    • C01B32/55Solidifying

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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
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Description

【0001】
【産業上の利用分野】
本発明は、ドライアイス成形機におけるブロック状ドライアイスの製造方法とその製造装置に関するものである。
【0002】
【従来の技術】
ブロック状ドライアイスは、ドライアイス製造装置の成形室内に液化炭酸ガスを噴霧して雪状のドライアイスを生成し(以下、「スノー」と称する)、これを圧縮成形するものであるが、この際、成形室内に生成するスノーの量を適正にする必要がある。
【0003】
従来、生成するスノーの量は供給液化炭酸ガス量をタイマーを利用して一定時間供給することにより制御している。また、液化炭酸ガスは入口ノズルより成形室に供給されると、炭酸ガスとスノーとに分離し、炭酸ガスは、上方の水平に取付けられた炭酸ガス出力ノズルより排出され、再液化工程へ戻されたり、大気中に放出されている。一方、スノーは、圧縮成形され、ドライアイスとして次工程へ送り出される。
【0004】
このような製造方法では、しばしば炭酸ガス出口ノズルよりガスとして排出される炭酸ガス量が異常に多くなることがある。それは、炭酸ガス出口ノズルからガスに同伴されてスノーが持ち出される(以下、「キャリオーバー」と称する)からである。このキャリオーバーが生じると、スノーにより出口ノズルを少しずつ閉塞し、運転状態が不安定になり、やがては完全に閉塞するために、運転を停止し解体排除するか、スチーム等で加熱除去する必要が生じる。
【0005】
【発明が解決しようとする課題】
本発明は上記した従来技術における課題を解決しようとするものであり、製品ドライアイスの重量変化を減少せしめると共に、炭酸ガス出口ノズルからキャリオーバーされるスノーを極力減少せしめて、安定した製造を可能としかつ製品収率を向上せしめることにある。
【0006】
【課題を解決するための手段】
上記した本発明の課題は、ドライアイス成形室内に液化炭酸ガスを噴出し、生成した雪状ドライアイスを圧縮するブッロック状ドライアイスの製造方法において、生成した雪状ドライアイスと分離した炭酸ガスが成形室垂直面に対し30〜60°の上方向に排出し、かつ炭酸ガス出口ノズルを通過する炭酸ガス流速を1〜4m/secの範囲に制御することによって、好ましいブロック状ドライアイスの製造方法が提供される。
【0007】
また、本発明は、液化炭酸ガス噴出ノズル、炭酸ガス出口ノズルおよび雪状ドライアイスを圧縮成形する押し板を具備するドライアイス成形室からなるブロック状ドライアイスの製造装置において、炭酸ガス出口ノズルの取付け角度を成形室垂直面に対して上向き30〜60°としたことを特徴とするブロック状ドライアイスの製造装置をも提供するものである。
【0008】
本発明の方法および装置により製造されるブロック状ドライアイスの形状および大きさとしては、目的とする広範囲のものに対応して適用することができるが、例えば25〜100kg程度のものが一般的であり、これに対応してドライアイス成形室の形状および大きさが定まる。
【0009】
ドライアイス成形室内に液化炭酸ガスを噴出し、生成したスノーを圧縮するブロック状ドライアイスの製造方法において、炭酸ガス出口ノズルを通過するガス流速は製品ドライアイスの製品重量、換言すれば単位当たりの重量を制御する上において極めて重要であり、この流速を1〜4m/sec、好ましくは1〜3m/secの範囲に制御することによって極めて容易となる。この場合のガス流速が1m/secに満たない場合は、製造効率が低下することとなり、一方、4m/secを越える場合は、キャリオーバーの量が多くなり均一な重量の製品が得られなくなる。
【0010】
ガス流速を上記の範囲に制御する方法としては、液化炭酸ガス噴出量、噴出ノズル孔の径、ノズル数の選定等による方法が採用されるが、このような制御によって、生成した雪状ドライアイスの一定した圧力による圧縮成形が可能となる。
【0011】
生成したスノーのキャリオーバーを少なくし製造を安定化するための好ましい1つの方法は、液化炭酸ガスを噴出し生成したスノーと分離した炭酸ガスを成形室垂直面に対して30〜60°の上方向に排出する方法である。このような方法を採用することによって炭酸ガスを成形室垂直面に対して水平に排出した従来の炭酸ガス排出方法に比して、炭酸ガス出口ノズルの閉塞もなく、製造を安定にし、結果としてキャリオーバーを減少せしめると共に製品収率を向上させることができる。上記した排出方向が上向き30°に満たない場合は加工が困難になり、一方、上向き60°を越える場合は炭酸ガス出口ノズルの閉塞が顕著となり、この範囲内に制御することによって多少のキャリオーバーが炭酸ガス排出ノズル内に付着しても、生成したスノーが再び成形室内に落下するようになり、好ましい結果を招来する。
【0012】
本発明の方法において、上記した炭酸ガス出口ノズルにおいて排出される炭酸ガス流出速度を制御するドライアイスの製造方法による場合は、前記した形状および大きさのブロック状ドライアイスの製造において、通常、60〜70秒の液化炭酸ガス噴出時間で充分である。
【0013】
本発明の理解を助けるために、以下に本発明の装置の1例を図によって示すが、図1は従来のブロック状ドライアイスの製造装置であり、図2は本発明の製造装置の1例である。
【0014】
図において、1はドライアイス成形室であり、2は液化炭酸ガス噴出ノズルであり、製品形状、大きさ等からの所望により1ないし複数ケが設けられる。3は炭酸ガス出口ノズルであり、上記と同様に、必要により1ないし複数ケ設けられる。なお、図2の炭酸ガス出口ノズル3の取付け角度は成形室垂直面に対して上向き45°として示してある。4は雪状ドライアイスを圧縮成形する際の押し板を示すものであり、所望のブロック状ドライアイスの賦形のための圧縮圧が得られるように設計されている。また、5は賦形されたブロック状ドライアイスを排出する際の底板である。
【0015】
【実施例】
以下、実施例および比較例により本発明を説明する。
【0016】
実施例
寸法巾約500mm、長さ約500mm、高さ約280mmのブロック状ドライアイスの製造装置において、成形室内高さを1145mmとし、底部よりの高さ405mmの位置に液化炭酸ガス噴出ノズル1ケを設け、855mmの位置に炭酸ガス出口ノズル4ケを設けた。
【0017】
【表1】

Figure 0003562822
【0018】
【発明の効果】
本発明により、(1)製品ドライアイスの重量変化が少なくなる。(2)安定した運転が連続できる。(3)スチーム等の使用を不要とする。(4)スノーの収率が向上し、結果的に製品収率が向上する。
【図面の簡単な説明】
【図1】従来のブロック状ドライアイスの製造装置を示す。
【図2】本発明のブロック状ドライアイスの製造装置の1例を示す。
【符号の説明】
1 成形室
2 液化炭酸ガス噴出ノズル
3 炭酸ガス出口ノズル
4 押し板
5 底板[0001]
[Industrial applications]
The present invention relates to a method and apparatus for producing block-shaped dry ice in a dry ice forming machine.
[0002]
[Prior art]
The block-shaped dry ice is formed by spraying liquefied carbon dioxide gas into a forming chamber of a dry ice producing apparatus to generate snow-like dry ice (hereinafter referred to as “snow” ), and compression-molding the dry ice. At this time, it is necessary to make the amount of snow generated in the molding chamber appropriate.
[0003]
Conventionally, the amount of generated snow is controlled by supplying a supplied liquefied carbon dioxide gas amount using a timer for a certain period of time. When the liquefied carbon dioxide gas is supplied from the inlet nozzle to the molding chamber, it is separated into carbon dioxide gas and snow, and the carbon dioxide gas is discharged from the horizontally mounted carbon dioxide gas output nozzle and returned to the reliquefaction step. Has been or has been released into the atmosphere. On the other hand, snow is compression-molded and sent to the next step as dry ice.
[0004]
In such a manufacturing method, the amount of carbon dioxide gas discharged as gas from the carbon dioxide gas outlet nozzle often becomes abnormally large. This is because snow is taken out of the carbon dioxide gas outlet nozzle along with the gas (hereinafter referred to as “carryover” ). When this carryover occurs, the outlet nozzle is gradually blocked by snow, and the operating state becomes unstable.In time, the outlet nozzle is completely blocked, so it is necessary to stop the operation and remove it or remove it by heating with steam etc. Occurs.
[0005]
[Problems to be solved by the invention]
The present invention is intended to solve the above-mentioned problems in the prior art, and reduces the weight change of the product dry ice and minimizes the snow carried over from the carbon dioxide gas outlet nozzle to enable stable production. And to improve the product yield.
[0006]
[Means for Solving the Problems]
The object of the present invention described above, spewing dry ice molding chamber liquefied carbon dioxide, in Burrokku like dry ice manufacturing method of compressing the generated snow-like dry ice, produced carbon dioxide gas is separated from the snow-like dry ice was the A preferable method for producing block-shaped dry ice by discharging upward in the direction of 30 to 60 ° with respect to the vertical surface of the molding chamber and controlling the flow rate of carbon dioxide gas passing through the carbon dioxide gas outlet nozzle in the range of 1 to 4 m / sec. Is provided.
[0007]
Further, the present invention provides a block-shaped dry ice manufacturing apparatus including a liquefied carbon dioxide gas ejection nozzle, a carbon dioxide gas outlet nozzle, and a dry ice forming chamber including a push plate for compression-molding snow-like dry ice. Another object of the present invention is to provide a block-shaped dry ice production apparatus characterized in that the mounting angle is set to 30 to 60 degrees upward with respect to the vertical surface of the molding chamber.
[0008]
The shape and size of the block-shaped dry ice manufactured by the method and the apparatus of the present invention can be applied in accordance with a wide range of purposes, and for example, a shape of about 25 to 100 kg is generally used. The shape and size of the dry ice forming chamber are determined correspondingly.
[0009]
In the method for producing block-shaped dry ice in which liquefied carbon dioxide gas is injected into the dry ice forming chamber and the generated snow is compressed, the gas flow rate passing through the carbon dioxide gas outlet nozzle is the product weight of the product dry ice, in other words, the unit weight per unit. It is very important in controlling the weight, and it becomes extremely easy to control this flow rate in the range of 1 to 4 m / sec, preferably 1 to 3 m / sec. In this case, if the gas flow rate is less than 1 m / sec, the production efficiency is reduced. On the other hand, if the gas flow rate is more than 4 m / sec, the carry-over amount increases and a product having a uniform weight cannot be obtained.
[0010]
As a method of controlling the gas flow rate within the above range, a method of selecting the amount of liquefied carbon dioxide gas ejected, the diameter of the ejection nozzle hole, the number of nozzles, and the like is adopted. Compression molding with a constant pressure.
[0011]
One preferred way to less the generated snow carryover stabilize production, on a 30 to 60 ° snow and separated carbon dioxide gas generated by ejecting the liquefied carbon dioxide on the molding chamber the vertical plane It is a method of discharging in the direction . By adopting such a method, compared to the conventional carbon dioxide gas discharging method in which carbon dioxide gas is discharged horizontally to the vertical surface of the molding chamber, there is no blockage of the carbon dioxide gas outlet nozzle and the production is stabilized, and as a result, The carryover can be reduced and the product yield can be improved. If the discharge direction described above is less than the upward 30 ° machining becomes difficult, whereas blockage of the carbon dioxide outlet nozzles if it exceeds upward 60 ° becomes remarkable, some carryover by controlling within this range Even if the carbon dioxide adheres to the inside of the carbon dioxide gas discharge nozzle, the generated snow falls into the molding chamber again, which brings about a favorable result.
[0012]
In the method of the present invention, when the method for producing dry ice that controls the outflow rate of carbon dioxide gas discharged from the carbon dioxide gas outlet nozzle described above is used, in the production of block-shaped dry ice having the above-described shape and size, usually 60 A liquefied carbon dioxide ejection time of ~ 70 seconds is sufficient.
[0013]
In order to facilitate understanding of the present invention, an example of the apparatus of the present invention is shown below with a diagram. FIG. 1 shows a conventional apparatus for producing dry ice in a block form, and FIG. 2 shows an example of the apparatus of the present invention. It is.
[0014]
In the figure, reference numeral 1 denotes a dry ice forming chamber, 2 denotes a liquefied carbon dioxide gas jet nozzle, and one or a plurality of nozzles are provided as required according to the product shape and size. Reference numeral 3 denotes a carbon dioxide gas outlet nozzle, and one or a plurality of carbon dioxide outlet nozzles are provided as necessary, as described above. The mounting angle of the carbon dioxide gas outlet nozzle 3 in FIG. 2 is shown as 45 ° upward with respect to the vertical plane of the molding chamber. Reference numeral 4 denotes a pressing plate for compression-molding snow-like dry ice, which is designed to obtain a desired compression pressure for shaping dry ice in a block shape. Reference numeral 5 denotes a bottom plate for discharging the shaped block-shaped dry ice.
[0015]
【Example】
Hereinafter, the present invention will be described with reference to Examples and Comparative Examples.
[0016]
Example In a block-shaped dry ice producing apparatus having a width of about 500 mm, a length of about 500 mm, and a height of about 280 mm, the height of the molding chamber is 1145 mm, and one liquefied carbon dioxide gas jet nozzle is located at a height of 405 mm from the bottom. And four carbon dioxide gas outlet nozzles were provided at a position of 855 mm.
[0017]
[Table 1]
Figure 0003562822
[0018]
【The invention's effect】
According to the present invention, (1) the change in weight of the product dry ice is reduced. (2) Stable operation can be continued. (3) Use of steam or the like is unnecessary. (4) The yield of snow is improved, and as a result, the product yield is improved.
[Brief description of the drawings]
FIG. 1 shows a conventional apparatus for producing dry ice in a block form.
FIG. 2 shows an example of a block-shaped dry ice producing apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Molding room 2 Liquefied carbon dioxide gas jet nozzle 3 Carbon dioxide gas outlet nozzle 4 Push plate 5 Bottom plate

Claims (2)

ドライアイス成形室内に液化炭酸ガスを噴出し、生成した雪状ドライアイスを圧縮するブロック状ドライアイスの製造方法において、生成した雪状ドライアイスと分離した炭酸ガスが成形室垂直面に対し30〜60°の上方向に排出し、かつ炭酸ガス出口ノズルを通過する炭酸ガス流速を1〜4m/secの範囲に制御することを特徴とするブロック状ドライアイスの製造方法。In the method for producing block-shaped dry ice in which liquefied carbon dioxide gas is jetted into a dry ice forming chamber and the generated snow-like dry ice is compressed , carbon dioxide gas separated from the generated snow-like dry ice is 30 to 30 mm from the vertical surface of the forming chamber. A method for producing block-shaped dry ice, characterized in that the flow rate of carbon dioxide gas discharged upward by 60 [deg.] And passing through a carbon dioxide gas outlet nozzle is controlled within a range of 1 to 4 m / sec. 液化炭酸ガス噴出ノズル、炭酸ガス出口ノズルおよび雪状ドライアイスを圧縮成形する押し板を具備したドライアイス成形室からなるブロック状ドライアイスの製造装置において、炭酸ガス出口ノズルの取り付け角度を成形室垂直面に対し上向き30〜60°としたことを特徴とするブロック状ドライアイスの製造装置。In a block-shaped dry ice manufacturing apparatus comprising a liquefied carbon dioxide gas ejection nozzle, a carbon dioxide gas outlet nozzle, and a dry ice forming chamber equipped with a pressing plate for compression-molding snowy dry ice, the mounting angle of the carbon dioxide gas outlet nozzle is set to be perpendicular to the forming chamber. An apparatus for producing a block-shaped dry ice, wherein the apparatus is oriented upward by 30 to 60 degrees with respect to a surface.
JP02261593A 1993-02-10 1993-02-10 Method and apparatus for producing block-shaped dry ice Expired - Lifetime JP3562822B2 (en)

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Application Number Priority Date Filing Date Title
JP02261593A JP3562822B2 (en) 1993-02-10 1993-02-10 Method and apparatus for producing block-shaped dry ice

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JPH06234513A JPH06234513A (en) 1994-08-23
JP3562822B2 true JP3562822B2 (en) 2004-09-08

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